Ecological risk of Bt transgenic cotton and its management strategy HPLC analysis of main flavonoid chemicals and their spatio-temporal dynamics in Bt transgenic cotton A SYSTEMATIC EVALUATION OF THE EFFECTS OF Bt TRANSGENIC COTTON ON THE GROWTH AND DEVELOPMENT OF COTTON BOLLWORM Bt Insecticidal Gene and Its Temporal Expression in Transgenic Cotton Plants Genotypic variations of yields and nitrogen nutrition efficiencies in Bt transgenic cotton Effects of CpTI+Bt transgenic cotton and Bt transgenic cotton on population increase and preference of Spodoptera exigua EFFECTS OF Bt (BACILLUS THURINGIENSIS)TRANSGVNIC COTTON ON THE DYNAMICS OF PEST POPULATION AND THEIR ENEMIES FIELD RESISTANCE EVALUATIONS OF BT TRANSGENIC COTTON GK SERIES TO COTTON BOLLWORM Effect of salt stress on growth and development of Bt transgenic cotton mutants and their parent cultivars